Malicious PDF — malware analysis report

Static analysis result for SHA-256 57fd96da96f48bfb…

MALICIOUS

PDF

87.8 KB Created: 2021-03-15 21:33:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 38531ec9d77413ce261a6b144f9ffa3d SHA-1: f45540398a1fde30bdb2dec08f6757108a0d335a SHA-256: 57fd96da96f48bfbf2480cd2da56507833b9ea143a0a2934195c3632ada5ca78
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pelibifir.ru/award?keyword=autodesk+sketchbook+tutorial+for+beginners+pdf PDF link annotation
    • https://wesodopudo.weebly.com/uploads/1/3/4/2/134234684/c88d0.pdfIn PDF document text
    • https://dikemogegopur.weebly.com/uploads/1/3/1/4/131406608/sakufone_sewudasejedo_kizavatagej.pdfIn PDF document text
    • https://cdn.sqhk.co/xewumoxu/0nUsPQL/minecraft_bee_template_tutorial.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408583/normal_5fe6364c1372a.pdfIn PDF document text
    • http://suboxobuwofum.iblogger.org/pixizujusimomegovupow.pdfIn PDF document text
    • https://lexawuvake.weebly.com/uploads/1/3/4/6/134610488/tupirerat.pdfIn PDF document text
    • http://biteroz.iblogger.org/kenmore_front_load_washer_error_f21.pdfIn PDF document text
    • http://gusedori.iblogger.org/how_to_start_a_cabrio_washer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368466/normal_5ff7fbd86f182.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455681/normal_5fefb145bc44d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480878/normal_6029058a7c527.pdfIn PDF document text
    • https://cdn.sqhk.co/fafujedajir/Yjfq3FC/44756762239.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369308/normal_6017715c80cb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404990/normal_5fe8a164b64da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454056/normal_600aadcf78fe0.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/LbWggnX/olympics_2021_tickets_price.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403140/normal_5fe43fa4de2c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426090/normal_603b7b71245fd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c07d1b62-ea8d-44c6-a4c9-06299692bde8/90355290885.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa45d51f-36ff-431a-935c-46012c1a021c/wasuwen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deda836b-7cbf-4c6f-892d-ca03a323d199/33244045727.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37cfce51-30e5-47a4-beb9-a80f5afc1eee/how_to_test_a_4_wire_oxygen_sensor_with_a_multimeter.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001180a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180A 5612 bytes
SHA-256: 27cb2696bfb3dda2d35d4f23c047398fbf7243b96a9affe3d6d1d7b0a9a583b2
font_01_sfnt_off00012b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B18 11280 bytes
SHA-256: 0dd455ae7b7d8095c1aae5bab98479e423eeb7f47c4e58f312ad066ab124388e

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